PSAT Math Multiple-Choice Practice Question 711

Correct Answer: C

Explanation:

(C) First, distribute the -5:

Now we want to get all of the x-terms on one side and all of the constant terms on the other side. Let's start by adding 5x to both sides:

Now all of the x-terms are on the left, so we want all constant terms on the right. Let's subtract from both sides:

Dividing both sides by 20 will isolate the c:

This simplifies to , which is choice (C).